创建一个中间件

中间件需要实现 VCLightMiddleware 接口。

接口定义

import { VCLightMiddleware, VCLightRequest, VCLightResponse, VCLightApp } from "vclight";

export default interface VCLightMiddleware {
    process(request: VCLightRequest, response: VCLightResponse, app: VCLightApp): Promise<void>;
    post(request: VCLightRequest, response: VCLightResponse, app: VCLightApp): Promise<void>;
}

• process 按注册顺序执行
• post 在 process 阶段结束后按逆序执行

示例

import { VCLightMiddleware, VCLightRequest, VCLightResponse, VCLightApp } from "vclight";

class ExampleMiddleware implements VCLightMiddleware {
    async process(request: VCLightRequest, response: VCLightResponse, _app: VCLightApp): Promise<void> {
        if (request.url === "/hello/") {
            response.response = "Hello!";
            response.end = true;
        }
    }

    async post(_request: VCLightRequest, _response: VCLightResponse, _app: VCLightApp): Promise<void> {
        // 可选的后处理
    }
}

应用中间件

const exampleMiddleware = new ExampleMiddleware();
app.use(exampleMiddleware);